Using the concept of bias, it is found that the correct option is:
(A) Employees may not want to give critical feedback in person to their manager, so this is likely an overestimate of Valerie's performance.
Samples have to be well chosen, otherwise, there can be a source of bias. For example, if you want to make a survey about who is better, Pele or Maradona, if you choose only Brazilians, or only Argentinians, the results will be biased, thus a sample with an equal number of Brazilians and Argentinians should be used.
In this problem, Valerie's is their manager, and the employees may be reluctant to give her critical feedback, which means that the proportion of 83% is an overestimate, and the correct option is:
(A) Employees may not want to give critical feedback in person to their manager, so this is likely an overestimate of Valerie's performance.
A similar problem is given at https://brainly.com/question/25122507